Teeter totter beam



FIG. 1 is a perspective view of my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a side elevation view thereof, both sides being identical; and,

FIG. 4 is an end elevation view thereof, both ends being identical.

The environmental structure shown in broken lines is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a teeter totter beam, as shown and described. 